Unable to test Mail-Sendmail module of perl

Hi All,
Very good morning.
I have installed Mail-Sendmail-0.79 module of perl to try few things.The readme says that I have to edit the test.pl to check if the mail is sent to my email ID.I have edited the test.pl according.But I have few queires here

Code:

# if you want to get a copy of the test mail, you need to specify your
16 # own server here, by name or IP address
17 $server = 'xx.xx.xx.xx';
18 #$server = 'my.usual.mail.server';

I am not sure of the IP address of the mail server that I am using.If I want to get the test mail to my yahoo account what settings do I need to give?

Trying to send a message to the author (and/or whoever if you edited test.pl)

(The test is designed so it can be run by Test::Harness from CPAN.pm.
Edit it to send the mail to yourself for more concrete feedback. If you
do this, you also need to specify a different mail server, and possibly
a different From: address.)